An intrinsic semiconductor at?absolute zero temperature is a
1). Superconductor?
2). good conductor?
3). Perfect insulator
4). ?none
2. A photostat machine works on
3. The quality or tone of a musical sound produced by a stringed instrument depends on
4. Which of the following causes adiabatic temperature changes in atmosphere?
6. The audible requency range of?human ear is
7. Pure water is bad conductor of electricity because it is
8. Energy of Ultraviolet rays is great than